<!doctype html>
<html>
<head>
	<title>HTML Tables Exercise 4</title>
</head>
<body>
	<form method="get" action="#">
		<table border="1">
			<colgroup>
				<col width="35px"/>
				<col width="35px"/>
				<col width="35px"/>
				<col width="35px"/>
			</colgroup>
			<thead>
				<tr>
					<th colspan="4" align="center">
						<input type="text" value="0"/>
					</th>
				</tr>
			</thead>
			<tbody>
				<tr>
					<td align="center"><input type="button" value="1"/></td>
					<td align="center"><input type="button" value="2"/></td>
					<td align="center"><input type="button" value="3"/></td>
					<td align="center"><input type="button" value="+"/></td>
				</tr>
				<tr>
					<td align="center"><input type="button" value="4"/></td>
					<td align="center"><input type="button" value="5"/></td>
					<td align="center"><input type="button" value="6"/></td>
					<td align="center"><input type="button" value="-"/></td>
				</tr>
				<tr>
					<td align="center"><input type="button" value="7"/></td>
					<td align="center"><input type="button" value="8"/></td>
					<td align="center"><input type="button" value="9"/></td>
					<td align="center"><input type="button" value="*"/></td>
				</tr>
				<tr>
					<td colspan="2" align="center"><input type="button" value="0"/></td>
					<td align="center"><input type="button" value="."/></td>
					<td align="center"><input type="button" value="/"/></td>
				</tr>
			</tbody>
		</table>
	</form>
</body>
</html>